Equating Ports to Data Bits

[Osiris]

Hi Melanie,

Thanks for the explanation. Indeed I had no choice but to scatter my bus around because some of my port bits are for dedicated hardware and since the pins have special features (like hardware interrupt, HUART, HPWM, etc) I had no choice but to scatter them about.

My worry is that I did try the following:

Myword Var word

Myword.0=PortA.3
Myword.1=PortB.7
...
Myword.15=PortC.4


But when I write the following statement it does not transfer the configuration to the port:

newdata var word

Newdata = 1234
Myword = Newdata

I would assume it would transfer the bit pattering from "newdata" to "myword" which would then output the bits on the associated ports.

It seems too simple of a problem and at the back of my head I have a feeling that I'm missing something very fundamental which does not allow the program to work.

Many thanks,
Osiris

[Melanie]

In your first example...

Myword Var word

Myword.0=PortA.3
Myword.1=PortB.7
...
Myword.15=PortC.4

...you transfer the contents of the Port Pins into your variable.

Newdata = 1234
Myword = Newdata

Now the above two lines stuffs Myword with the contents of Newdata ie 1234.

If now you want that to appear on the Port Pins, you have to do the reverse of what you originally did... ie...

PortA.3=Myword.0
PortB.7=Myword.1
...
PortC.4=Myword.15

Remember Myword is a RAM variable, not a Port alias.